Metal container for beverages



July 26, 1938. A. L. KRONQUEJST METAL CQNTAINER FOR BEVERAGES Filed April 8, 1936 'a azw Patented July 26, 1938 PATENT OFFICE METAL CONTAINER FOR BEVERAGES Alfred L. Kronquest, Syracuse, N. Y., assignor to Continental Can Company, Inc., New York, N. Y., a corporation of New York Application April 8, 1936, Serial No. 73,354

2 Claims.

In my prior Patent No. 2,117,180, granted May 10, 1938, I have shown and described a metal can for beverages which is provided with a coating on the inner face thereof after the can is made up and ready for filling, which coating is chemically inert to the action of the beverage thereon and which prevents the beverage from contacting with the metal of the can. The present invention relates to an improvement in the can disclosed in the aforesaid patent.

An object of the invention is to provide a can wherein the bottom end is so shaped as to facilitate the forming of a coating which completely covers the same.

A further object of the invention is to provide a can of the above type wherein the bottom end is so shaped as to remain rigid and free from bulging under the internal strains placed thereon incident to the pasteurizing of the beverage after the can is closed.

In the drawing:

Figure 1 a sectional viewnthrougnb can embodying the improvements; 1"

Fig. 2 is a bottom end view thereof; and

Fig. 3 is an enlarged sec the lower portionpig-ihe can V v The can embodying my improvements includes a body portion 1 which is made from sheet metal rolled into cylindrical form and having its side of the body portion is provided with the usual flange and the top closure end 3 is secured thereto by a double seam 4. The closure end 3, as shown, is dome-shaped, and terminates in a neck portion to which a crown cap 5 may be secured for closing the same.

The body portion I is flanged at its lower edge and a bottom end 6 is secured thereto by double seaming, as indicated at I. This bottom end is so shaped as to provide an inset portion 9 which extends into the body substantially a distance equal to the height of the double seam I. This is for the purpose of enabling a chuck to be inserted in the end against which the metal parts are rolled in the forming of the double seam I. From the point 10 to the point I l at the opposite side of the can body and on every diameter of the can end, the metal is curved continuously and uniformly so as to provide an inwardly extend- 50 mg dome, shaped preferably with the same radius of curvature throughout its entire extent.

The can is coated on the interior thereof with a material which is thermoplastic and which has no deleterious effect upon the beverage which is to be stored in the can. Such a coating is indithrew? edges joined by a side seam 2. Theupper end cated at l2. The coating completely covers the entire surface of the body and the ends thereof. The coating used is preferably a petroleum wax which has the characteristic of being ductile at low temperature, so that it will not fracture when the metal of the can is bumped and bent and which also has a melting point of 160 F., so that it remains solid and firm on the can wall even when the canis heated to the temperature used for the pasteurizing of beer. The thermoplastic coating material is melted and poured or sprayed over the inner surface of the can, and the surplus material is drained from the can leaving a thin film adhering to the wall of the can. One of the purposes of shaping the bottom as described above is to insure that said end is free from shoulders. When the bottom end has an annular rib or shoulder, the wax or like material thins to a point at the shoulder which is likely to expose the metal. When, however, the metal has a continuous uniform shaping free from shoulders, then there is a substantial coating film formed over the entire extent of said bottom end. The material used for the coatin of the interior of the can is preferably a petrolewax produced in the de-waxing of residual lubricating oils, such as cylinder stocks. One of these waxes is known to the trade as"Cerese EE 'wax. Such a wax is particularly useful in the coating of a thin sheet metal can, as it is very ductile at low temperatures and does not crack or craze when the metal wall is accidentally bent. It also has a suiliciently high boiling point so that it remains solid and undisturbed when the beverage is heated to a suflicient temperature for the pasteurizing of the same. It will be understood, however, that other forms of thermoplastic coating materials may be used.

When beer is packed in a can and the can sealed, it is subjected to a. pasteurizing temperature which creates an internal pressure within the can which produces a heavy bulging strain on the ends of the can. The curved bottom end forms a very rigid structure, resisting the internal pressure and the bottom, end is not bulged or flexed so as to disturb the coating adhering thereto at the junction of the side wall of the body and the bottom. end.

While the can as illustrated is provided with a dome-shaped top end, closed by a crown cap, it will be understood that from certain aspects of the invention, the upper end of the can body may be otherwise closed. The essential features of the present invention reside in the construction of the bottom end which is shaped so as to give strength thereto and facilitate the coating of the same with a substantially uniformthickness of material.

Having thus described the invention, what vI claim as new and desire to secure by Letters Patent, is:

1. A sheet metal container for beverages including a cylindrical body portion, the edges of which are joined by a solder bonded seam, a top end secured to said body portion by double-seaming, said top end being dome-shaped and terminating in a neck portion to which a crown cap may be secured for closing the same, a bottom end secured to said body portion by double-seaming, said bottom end having a portion thereof extending inwardly and contacting with the body wall in the region of the double seam, said bottom end between said inwardly extending portions being uniformly concave from the inner face of the body wall at one side of the can body to the inner face of the body wall at the other side thereof, said body and top and bottom ends having on the inner face thereof a continuous coating of a petroleum wax firmly adhering to and completely covering the inner surface of the body, the inner surface of the top end and the inner surface of the bottom end.

2. A sheet metal container for beverages'ineluding a cylindrical body portion, a bottom end secured to said body portion by double seaming, said bottom end having a portion thereof extending inwardly and contacting with the body wall in the region of the double seam, said bottom end between said inwardly extending portions being uniformly concave from the inner face of the body wall at one side of the can body to the inner face of the body wall at the other side thereof, said body wall and bottom end having on the inner face thereof a continuous coating of a petroleum wax firmly adhering to and completely -covering the inner surface of the body, and the inner surface of the bottom end.

ALFRED L. KRONQUEST. 

